A Certina DS-2 Certronic stainless steel day date wristwatch, early 1970s, with ESA 9164 ‘tuning fork’ movement, the signed circular blue dial with applied luminous baton numerals and hands, red sweep seconds hand, day date aperture at 3, in brushed polished stainless steel case with signed crown and turtle back, on signed bracelet, with original red Certina box, watch head diameter 44mm. £200-300

Certina was one of the many watch makers in the early 1970s to produce an electronic model that employed ESA’s 9162 or 9164 tuning fork movements.